Parotid gland-recovery after radiotherapy in the head and neck region - 36 months follow-up of a prospective clinical study

Table 5 Multiple linear regression analyses for relative salivary flow rates (RSFRs) in the observation periods 12, 24 and 36 months.

Variables	RSFRs (%) of 12 months after RT (R² = 0.299)		RSFRs (%) of 24 months after RT (R² = 0.199)		RSFRs (%) of 36 months after RT (R² = 0.416)
	ß (SE)	p-value	ß (SE)	p-value	ß (SE)	p-value
D _mean lowest parotid gland	-1.187 (0.244)	0.0001	-0.736 (0.338)	0.034	-1.160 (0.395)	0.006
Tumor site	8.886 (2.815)	0.002	7.796 (4.178)	0.068	11.310 (4.640)	0.021
T stage	-2.429 (3.173)	0.446	-5.880 (4.671)	0.214	-10.047 (5.230)	0.064
N stage	-2.870 (2.143)	0.184	-2.499 (3.232)	0.443	0.866 (4.153)	0.836

ISSN: 1748-717X